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WO2012019345A1 - Outil électrique portatif comprenant un ensemble de freinage amélioré - Google Patents

Outil électrique portatif comprenant un ensemble de freinage amélioré Download PDF

Info

Publication number
WO2012019345A1
WO2012019345A1 PCT/CN2010/075893 CN2010075893W WO2012019345A1 WO 2012019345 A1 WO2012019345 A1 WO 2012019345A1 CN 2010075893 W CN2010075893 W CN 2010075893W WO 2012019345 A1 WO2012019345 A1 WO 2012019345A1
Authority
WO
WIPO (PCT)
Prior art keywords
spindle
power tool
portable power
trigger
lock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2010/075893
Other languages
English (en)
Inventor
Bo Zhen
Aigui Wang
Songtao Jin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Power Tools China Co Ltd
Original Assignee
Bosch Power Tools China Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bosch Power Tools China Co Ltd filed Critical Bosch Power Tools China Co Ltd
Priority to RU2013110474/02A priority Critical patent/RU2013110474A/ru
Priority to US13/814,958 priority patent/US9724815B2/en
Priority to PCT/CN2010/075893 priority patent/WO2012019345A1/fr
Priority to CN201080068506.6A priority patent/CN103068530B/zh
Priority to DE112010005800T priority patent/DE112010005800T5/de
Publication of WO2012019345A1 publication Critical patent/WO2012019345A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor

Definitions

  • the invention relates to a portable power tool having an improved brake assembly which shuts down the power tool quickly after operation.
  • Portable power tools having rotational output are widely used. Many portable power tools do not have brake function. Generally, after the operation of a portable power tool, an operator has to hold the power tool for a period of time until the spindle of the power tool is totally stopped. Then, the operator can put the tool down. This is time-consuming and not convenient for the operator. In addition, it has a high risk of injury. Specifically, if the operator puts down the tool when the spindle of the tool is still rotating, the tool may hurt other items or people.
  • one solution for stopping the tool is using an electrically controlled brake for providing a braking force to the power tool.
  • the tool comprises a braking module, located between a motor and a power supply, for applying a current limited braking force to the motor when the power supply is disconnected from the motor.
  • the electrically controlled brake has high cost and low reliability.
  • a mechanical brake like the brakes adopted in vehicles. Specifically, a brake wheel is fixed on a motor spindle of the power tool, and a lever covered with rubber is adapted to contact and stop the brake wheel under the force of a compression spring.
  • the manipulation of the mechanical brake is independent of the operation of the motor. That is to say, after the operation of the tool, the operator needs to perform an additional action to stop the tool. This is cumbersome.
  • the spindle of the tool is locked from rotation for the purpose of, for example, exchanging the tool head or tool bit which is driven by the spindle.
  • conventional power tools with brake can stop quickly after operation, their spindles are not locked in place from rotation.
  • an object of the invention is to provide a portable power tool having an improved brake which functions as both a brake and spindle locking means.
  • the present invention provides a portable power tool comprising:
  • a motor mounted in the motor housing and having a rotary spindle
  • a trigger adapted to be actuated and released for switching on and off the motor respectively
  • a mechanical brake assembly connected with the trigger and automatically operated by the trigger such that the brake assembly releases the spindle when the trigger is activated and performs brake to the spindle when the trigger is released.
  • the brake assembly comprises a brake disc attached to the spindle, and a spindle lock carrying a friction material and being able to move in a first direction towards and away from the brake disc by means of the action of the trigger such that:
  • the spindle lock is moved away from the brake disc to bring the friction material out of contact with the brake disc.
  • the portable power tool further comprises a fan mounted to the spindle, wherein the brake disc is fixed to the base of the fan.
  • the first direction is parallel to the rotation axis of the spindle.
  • the portable power tool further comprises a slide rod which is slidably moved by the trigger and comprises a motion transmit mechanism for transmitting the movement of the slide rod into the movement of the spindle lock with respect to the brake disc.
  • the moving direction of the slide rod is perpendicular to that of the spindle lock, and the motion transmit mechanism is a cam portion of the slide rod.
  • the spindle lock is formed in a substantially flat shape extending in a plane perpendicular to the rotation axis of the spindle.
  • the portable power tool further comprises first returning means, such as an elastic member, e.g., a spring, which biases the spindle lock towards the brake disc.
  • first returning means such as an elastic member, e.g., a spring, which biases the spindle lock towards the brake disc.
  • the portable power tool further comprises a spindle locking member for temporarily locking the spindle from rotation.
  • the spindle locking member may be a metal ring fixed to the spindle.
  • the portable power tool further comprises a spindle locking member for temporarily locking the spindle from rotation, the spindle locking member being a nut for fastening the fan to the spindle.
  • the spindle lock is provided with a protrusion protruding towards the spindle locking member, and the spindle lock is also manually moveable in a second direction towards and away from the spindle locking member to bring protrusion into contact with and away from the spindle locking member.
  • the portable power tool further comprises second returning means, such as an elastic member, e.g., a spring, which biases the spindle lock away from the spindle locking member.
  • second returning means such as an elastic member, e.g., a spring, which biases the spindle lock away from the spindle locking member.
  • the second direction is perpendicular to the rotation axis of the spindle.
  • the invention provides a portable power tool having a new mechanical brake assembly which is kinematically coupled with and automatically operated by the trigger.
  • the brake assembly of the invention is simple and easy to operate.
  • the spindle lock is able to be acted on the spindle by both the friction material which is cooperative with the brake disc as well as by the protrusion which is cooperative with the spindle locking member.
  • the action area between the spindle lock and the spindle is large, which results in smooth, quick and reliable braking and locking.
  • This brake concept of the invention can be used on circular saws, angle grinders, marble cutters, and such power tools whose output is rotation.
  • Fig. 1 is a schematic cross-sectional view showing a part of a portable power tool according to an embodiment of the invention
  • Fig. 2 is a schematic view of the brake assembly of the portable power tool in the direction indicated by arrows A-A in Fig. 1 ;
  • Fig. 3 is a schematic view showing a part of the brake assembly in the direction indicated by arrow B in Fig. 2.
  • the portable power tool mainly comprises a motor housing 1, a motor 2 fixedly mounted in the motor housing and having a rotary spindle 20 which defines a rotation axis Z, a fan 3 fixedly mounted around the rotary spindle 20 within the motor housing by a nut 10, so as to be rotated by the spindle for cooling the motor, and a guard 6 mounted to the motor housing near a tool head (not shown) to be attached to the tip end of the spindle for preventing work piece fragments from reaching the operator of the tool.
  • the spindle 20 is rotatably supported near its tip end by a front bearing 9, which intern is carried by a supporting structure 22 fixed to or integrally formed with the motor housing 1 or the guard 6.
  • the portable power tool further comprises a brake assembly for stopping the rotation of the spindle after the operation of the tool is ended and locking the spindle from rotation.
  • the brake assembly mainly comprises a slide rod 4, a spindle lock 5, a friction material pad 7, a returning spring (such as one or more leaf springs) 8 and a brake disc 12, which will be described below.
  • the brake disc 12 is attached to a base face of the fan 3 in any manner known in the art, for example, clamped between the nut 10 and the base face of the fan 3.
  • the spindle lock 5 is formed in a substantially flat plate shape extending in a plane perpendicular to the rotation axis Z of the spindle 20 and is provided at a position in direction of the rotation axis Z corresponding to that of the nut 10.
  • the spindle lock 5 is moveably mounted near the front end of the motor housing 1, elongated in an X direction which is perpendicular to the rotation axis Z of the spindle 20.
  • the spindle lock 5 has an enlarged hollow middle portion 52 which surrounds the spindle 20 and the nut 10, and a protrusion 56 protruding in the X direction from the middle portion 52 towards the nut 10.
  • the nut 10 has a polygonal, preferably regular polygonal profile, so as to provide a planar side to be abutted by the protrusion 56.
  • the spindle lock 5 is movable in Z direction as indicated by arrow Rl in Figs. 1 and 3, and movable in X direction as indicated by arrow R2 in Figs. 1 and 2.
  • the movement of the spindle lock 5 in Z direction is actuated by the cam action of the slide rod 4, as will be described below.
  • Opposing notches 65 are formed through the back end of the guard 6 for permitting the movement of the spindle lock 5 in Z direction.
  • the returning spring 8 is fixed to the supporting structure 22 and normally biases the spindle lock 5 in a reverse direction opposite to arrow Rl .
  • the spindle lock 5 has an end (left end in Figs. 1 and 2) protruded out from the motor housing 1 and formed by bending as a pushing tab 55. By pushing this pushing tab 55, the spindle lock 5 is moved in X direction as indicated by arrow R2.
  • a return spring 11 which is a compression spring in the illustrated embodiment, is clamped between a protrusion 53 of the spindle lock 5 and the inner wall surface of the guard 6 and normally biases the spindle lock 5 in a reverse direction opposite to arrow R2.
  • the friction material pad 7 is attached to the backside of the middle portion 52 of the spindle lock 5 opposing to the brake disc 12. In the normal state of the spindle lock 5, the friction material pad 7 is clamped between the middle portion 52 and the brake disc 12 under the biasing force of the returning spring 8. Meanwhile, the spindle lock 5 is biased by the return spring 11 in the reverse direction opposite to arrow R2 so that the protrusion 56 is away from periphery of the nut 10.
  • the movement of the spindle lock 5 in the direction of arrow Rl is activated by the slide rod 4.
  • the slide rod 4 is slidable in a Y direction perpendicular to both the X direction and Z direction, as indicated by arrow R3 in Figs. 2 and 3.
  • the slide rod 4 is slidably attached to a supporting portion 62 of the guard 6 by a screw 13.
  • the slide rod 4 has a cam portion 45 which pushes the spindle lock 5 to move in the direction of arrow Rl when the slide rod 4 is moving in the direction of arrow R3.
  • the slide rod 4 is kinematically connected to a switch trigger 100 (schematically shown in Figs. 2 and 3). By actuating of the switch trigger, it will pull the slide rod in the direction of arrow R3. Returning means, such as a returning spring, is provided for the slide rod 4 for moving it towards its original position in a reverse direction opposite to arrow R3 when the switch trigger has been released.
  • the brake disc 12 is fixed to the fan 3, the friction material pad 7 is fixed to the spindle lock 5, and the slide rod is connected to the switch trigger.
  • the friction material pad 7 is pushed against the brake disc 12 by the pushing force of the returning spring 8, so that the tool is in a brake state.
  • the switch trigger When the operator operates the tool by actuating the switch trigger, the switch trigger pulls the slide rod 4 in the direction of arrow R3 against the pushing force of the returning spring 8 so that the cam portion 45 pushes the spindle lock 5 to move in the direction of arrow Rl .
  • the friction material pad 7 moves away from the brake disc 12, and now the spindle 20 is free to rotate.
  • the motor 2 is turned on by the actuating of the switch trigger, and the spindle 20 rotates to drive the tool head to perform an operation.
  • the operator keeps the switch trigger actuated.
  • the operator may push down the spindle lock 5 in the direction of arrow R2 by means of the pushing tab 55.
  • the protrusion 56 comes into contact with the planar side of the nut 10 to lock the spindle 20 from rotation.
  • the nut 10 forms a spindle locking member.
  • Other structures for this locking member are also applicable, if they can cooperate with the protrusion 56 to lock the spindle 20 from rotation.
  • the spindle locking member may be a metal ring fixed to the spindle.
  • the operator may release the pushing tab 55.
  • the spindle lock 5 is moved by the return spring 11 in the reverse direction opposite to arrow R2 so that the protrusion 56 moves away from periphery of the nut 10.
  • the basic concept of the invention is providing a mechanical brake assembly for the portable power tool.
  • the brake assembly is connected with the trigger and automatically operated by the trigger such that the brake assembly releases the spindle when the trigger is activated and performs brake to the spindle when the trigger is released. Any structures that can constitute a mechanical brake assembly having the above functions fall within the scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Sawing (AREA)
  • Braking Arrangements (AREA)
  • Portable Power Tools In General (AREA)

Abstract

Un outil électrique portatif comprend un carter de moteur (1), un moteur (2) monté dans le carter de moteur (1) et comprenant une broche rotative (20), un déclencheur (100) adapté à être actionné et libéré pour la commutation du moteur (2) en position marche et en position arrêt, respectivement, et un ensemble de freinage mécanique raccordé au déclencheur (100) et actionné automatiquement par le déclencheur (100) de sorte que l'ensemble de freinage libère la broche (20) lorsque le déclencheur (100) est activé et réalise le freinage sur la broche (20) lorsque le déclencheur (100) est libéré.
PCT/CN2010/075893 2010-08-11 2010-08-11 Outil électrique portatif comprenant un ensemble de freinage amélioré Ceased WO2012019345A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
RU2013110474/02A RU2013110474A (ru) 2010-08-11 2010-08-11 Ручная машина с усовершенствованным тормозным устройством
US13/814,958 US9724815B2 (en) 2010-08-11 2010-08-11 Portable power tool with improved brake assembly
PCT/CN2010/075893 WO2012019345A1 (fr) 2010-08-11 2010-08-11 Outil électrique portatif comprenant un ensemble de freinage amélioré
CN201080068506.6A CN103068530B (zh) 2010-08-11 2010-08-11 具有改进的制动组件的便携式电动工具
DE112010005800T DE112010005800T5 (de) 2010-08-11 2010-08-11 Elektrohandwerkzeug mit verbesserter Bremsanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2010/075893 WO2012019345A1 (fr) 2010-08-11 2010-08-11 Outil électrique portatif comprenant un ensemble de freinage amélioré

Publications (1)

Publication Number Publication Date
WO2012019345A1 true WO2012019345A1 (fr) 2012-02-16

Family

ID=45567273

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2010/075893 Ceased WO2012019345A1 (fr) 2010-08-11 2010-08-11 Outil électrique portatif comprenant un ensemble de freinage amélioré

Country Status (5)

Country Link
US (1) US9724815B2 (fr)
CN (1) CN103068530B (fr)
DE (1) DE112010005800T5 (fr)
RU (1) RU2013110474A (fr)
WO (1) WO2012019345A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104416448A (zh) * 2013-08-30 2015-03-18 英古所连公司 具有摩擦传动的研磨机

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CN202001331U (zh) * 2011-04-15 2011-10-05 博世电动工具（中国）有限公司 用于电动工具的风扇及电动工具
EP3150333B1 (fr) * 2015-09-30 2019-08-28 Chervon (HK) Limited Outil electrique portatif comprenant un ensemble de freinage amélioré
EP3476537A4 (fr) 2016-06-28 2020-03-11 Positec Power Tools (Suzhou) Co., Ltd Ponceuse, son procédé de fonctionnement et procédé de montage et de démontage de plaque de base de travail
CN107082355B (zh) * 2017-04-11 2018-10-26 斯冬凤 一种电力设备
CN107096187A (zh) * 2017-04-11 2017-08-29 广州佶兔工业设计有限公司 一种攀岩设备
CN107437757B (zh) * 2017-04-11 2019-01-18 扬州嘉吉机械有限公司 一种电力设备
CN109382735B (zh) * 2017-08-04 2022-01-18 苏州宝时得电动工具有限公司 砂光机
US20200338686A1 (en) * 2017-08-04 2020-10-29 Positec Power Tools (Suzhou) Co., Ltd. Grinding tool, and main component and grinding component thereof
JP7049145B6 (ja) * 2018-03-16 2022-04-19 株式会社マキタ 電動工具
CN210115785U (zh) 2018-12-17 2020-02-28 米沃奇电动工具公司 角磨机
DE102019208438A1 (de) * 2019-06-11 2020-12-17 Festool Gmbh Werkzeugvorrichtung und Verfahren
CN217669927U (zh) 2021-12-20 2022-10-28 创科无线普通合伙 刨槽机
CN116214470A (zh) * 2023-05-10 2023-06-06 江苏宏芯亿泰智能装备有限公司 一种打点治具
CN117226664A (zh) * 2023-08-29 2023-12-15 江苏东成机电科技有限公司 磨削工具

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DE4239559A1 (de) * 1992-11-25 1994-05-26 Festo Kg Handwerkzeugmaschine mit einer Blockiereinrichtung zum Blockieren der Werkzeugspindel beim Werkzeugwechsel
US7168502B2 (en) * 2000-08-17 2007-01-30 Hilti Aktiengesellschaft Electric power tool with locking mechanism
JP2004249420A (ja) * 2003-02-21 2004-09-09 Hitachi Koki Co Ltd 電動工具のブレーキ装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104416448A (zh) * 2013-08-30 2015-03-18 英古所连公司 具有摩擦传动的研磨机
CN104416448B (zh) * 2013-08-30 2018-11-02 英古所连公司 具有摩擦传动的研磨机

Also Published As

Publication number Publication date
RU2013110474A (ru) 2014-09-20
US9724815B2 (en) 2017-08-08
CN103068530A (zh) 2013-04-24
US20130292148A1 (en) 2013-11-07
DE112010005800T5 (de) 2013-06-13
CN103068530B (zh) 2015-09-23

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